_listeners:null and _loaded:false

[MakandarSahil]

This is console output of Voice object ->
voice {"_events": {"onSpeechEnd": [Function anonymous], "onSpeechError": [Function anonymous], "onSpeechPartialResults": [Function anonymous], "onSpeechRecognized": [Function anonymous], "onSpeechResults": [Function anonymous], "onSpeechStart": [Function anonymous], "onSpeechVolumeChanged": [Function anonymous]}, "_listeners": null, "_loaded": false}

ERROR [TypeError: Cannot read property 'startSpeech' of null]

_listeners:null and _loaded:false
How to overcome this ??